Composition for preventing set-offs in printing.



quarts of palm-oil.

UNITED STATES PATENT OFFICE.

GEORGE STEELE DUNUAE ANT) GEORGE HENRY POTTS, OF EDINBURGH,

SCOTLAND, ASSlGNORS TO THE AMERICAN OFFSET COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMPOSlTlON FOR PHEVENTlNG SET-OFFS IN PRINTING.

Specification of Letters Patent.

Patented July 1 0, 1906.

Application 51 1 August 7. 1985: Serial 30- 273,137.

following is a specificiiition.

In the specification of application Serial No. 259,374 we have described a liquid composition to be used for damping the set-oil rollers in printing-machines to prevent set oil or transfer of ink from one sheet to sun other or from one side to the reverse side of a sheet in printing.

Our present invention has for its object the provision of a liquid com osition to be used in the same manner as tie liquid composi tion the subject of the said application, but differing therefrom in its composition and possessing especial advantages if some or all of the work is to be done on colored or much loaded paper.

The constituents of the liquid composition the subject of our present invention are palmoil, cocoanutoil, lard-oil, cotton-seed oil, soap, preferably brown Windsor, printers, turpentine, naphtha as ordinarily used by printers, and methylated spirits of Wine. The cotton-seed oil may be omitted, but in such event the quantity of lard-oil or cocoanut-oil, or of both, should be increased proortionately. The best proportions are as ollows: about equal volumes of each of the oils, the palm-oil and cocoanut-oil having been melted by the application of heat before their volumes are measured out. Equal volumes of the turpentine and naphtha, the volume of each of these being nearly double that of the palm-oil. The volume of the methylated s irits is about threeuarters that of the pa m-oil. The Wei ht of t e soap should be about one pound or ever two A small quantity of sperm or light colza oil, or of both, not exceeding in volume half the'volume of the palnuoil, may be advantageouslv added to assist admixture. Although we iiud it preterable to use both cocoanut-oil and lard-oil in making the liquid composition the subject of our present invention, one may be par'iy or wholly replaced by the other.

Lard-oil is the equivalent of coccanut-oil, and where the latter is mentioned herein it is to he understood that either lard-oil or a mixture of lard and cocoanut oils may be used. Similarlv, light colza-oil is the equivalent of sperm-oil and may replace the latter either in Whole or in part without departing from our invention, which contemplates the employment of equivalents of the ingredients used.

' As it is desirable to apply heat to effect as good an admixture of the soap as possible, and accordingly to defer adding the naphtha untii after such heating, We have found it preferable, especially if the heating is done, for example, over an open fire, to employ the method described in the specification of the said application in effecting the mixture of the components of the liquid composition the subject of our present invention. Instead of naphtha, benzin may be used; but na htha is preferable.

aving now described our invention, what We claim, and desire to secure by Letters Patent of the United States, is

I. A composition for preventing set-oil consisting in a mixture of palm-oil, cocoanutoil, cotton-seed oil, soap, turpentine, naphthe and methylated spirits.

2. A composition for preventing set-off consisting in a mixture of palm-oil, eocoanutoil, cotton-seed oil, sperm-oil, soap, turpentine, naphtha and methplated spirits.

In testimony Whereo we have signed our names to this specification in the presence of two subscribing witnesses.

GEORGE STEELE BUNCAN. GEORGE HENRY POTTS. Witnesses:

MARY MoCnnnin, WALLACE CRANSTON FAIRWEATHER. 

